Gas burner for coke oven exhaust gas

ABSTRACT

Burner for burning industrial exhaust gas and particularly the exhaust gas from the chambers of coke oven batteries. The burner comprises a mixing tube for mixing gas and air having a gas feeding nozzle in communication with its upstream end and a burner head in communication with its downstream end. Air input openings lead into the mixing tube downstream of the gas feeding nozzle for providing a combustible mixture. The burner head extends downstream of the mixing tube and has a main channel which is basically cylindrical in form and an auxiliary annular channel surrounding the main channel and in communication with the main channel through gas openings. A burner tube extends about the burner head and is spaced radially therefrom. Air inlet openings lead into the burner tube downstream of the end of the burner head. An annular stabilizing baffle is spaced along the burner tube in front of the burner head. An electric igniter, which may be in the form of a trigger device, enters the burner tube and extends partially across the burner head in a diametrical direction in position to trigger ignition of the gas passing through said tube.

United States Patent [191 Pankow [75] Inventor: HorstPankow,Gelsenkirchen,

Germany [73] Assignee: Gewerkschaft Schalker Eisenhuette [22] Filed:Feb. 12, 1973 [2]] Appl. N0.: 331,808

[30] Foreign Application Priority Data Nov. 19, 1974 PrimaryExaminer-William F O*Dea Assistant Examiner-Harold Joyce Attorney,Agent, or Firm-Hill, Gross, Simpson, Van Santen, Steadman, Chiara &Simpson [5 7] ABSTRACT Burner for burning industrial exhaust gas andparticularly the exhaust gas from the chambers of coke oven batteries.The burner comprises a mixing tube for mixing gas and air having a gasfeeding nozzle in communication with its upstream end and a burner headin communication with its downstream end. Air input openings lead intothe mixing tube downstream of the gas feeding nozzle for providing acombustible mixture. The burner head extends downstream of the mixingtube and has a main channel which is basically cylindrical in form andan auxiliary annular channel surrounding the main channel and incommunication with the main channel through gas openings. A burner tubeextends about the burner head and is spaced radially therefrom. Airinlet openings lead into the burner tube downstream of the end of theburner head. An annular stabilizing baffle is spaced along the burnertube in front of the burner head. An electric igniter, which may be inthe form of a trigger device, enters the burner tube and extendspartially across the burner head in a diametrical direction in positionto trigger ignition of the gas passing through said tube.

5 Claims, 1 Drawing Figure GAS BURNER FOR COKE OVEN EXHAUST GAS FIELD OFTHE INVENTION Gas burner for burning the exhaust gas ovens and the like.

BACKGROUND, SUMMARY AND ADVANTAGES OF THE INVENTION from coke extendingwithin a burner tube, a mixing tube for mixing gas and air upstream ofthe burner head and an additional tube emptying into the burner tube inthe direction of flow of the gas through the tube. In this burningdevice, part of the gas is fed to the mixing tube through the burnerfeed nozzle. The gas flowing into the mixing tube at a relatively highrate of speed creates a vacuum, drawing air into the mixing tube to mixwith the gas and provide a combustible mixture. Air openings feed intothe mixing tube from the atmosphere to mix with the gas passingtherethrough. Ignition takes place by way of an igniter extending inadvance of the 1 main channel of the burner head. A smaller part of thecombustible mixture enters the burner head through bores provided at theupstream end of the burner head leading to the auxiliary channel, andflows in the direction of the combustible 'mixture into the burner tube.The combustible mixture flowing through the auxiliary channel has alesser speed than the gas flames which escape from the main channel ofthe burner, and causes a stabilization of the flame at the end of theburner head.

The advantages of the present invention over the gas burners of theprior art are in the operational safety of the burner and reduction ofmaintenance.

Operational safety is attained by placing the electrical igniter ortrigger device downstream of the burner head and extending in front ofthe burner head and by placing the combustion chamber or mixing meansbehind the burner head. This is further attained by encircling theburner head by an auxiliary annular channel surrounding and concentricwith the main channel and providing communicating passageways to thischannel.

The concentric arrangement of the auxiliary channel about the mainchannel provides rotational symmetrical flowing conditions of thecombustible mixture, and has a stabilizing effect on the flame at theend of the burner head. This stabilizing factor of the combustiblemixture along the electrical igniter, therefore, creates circumferentialeddy currents in the combustible mixture which are ignited by theigniter in the area ahead of the two channels.

This results in a highly stabilized flame, which does not vary uponfluctuation in pressures, which frequently occur in the burning of gasesfrom coke ovens.

A further advantage of the invention contributing toward the safety andefficiency in the burner is the provision of a burner tube encirclingthe burner head with openings leading from the atmosphere into theburner tube upstream of the flame end of theburner head,

which forms circular eddy currents in the field at the end of the burnerhead and has a. stabilizing effect on A still further advantage of theinvention is the connection of the feeding nozzle mixing tube burnerhead and burning tube in such a manner as to provide leak- J proofconnections between said members and enabling the burner to be readilytaken apart for maintenance and cleaning and to be reassembled with verylittle effort.

Other objects, features and advantages of the invention will be readilyapparent from the following de scription of a preferred embodimentthereof, taken in conjunction with the accompanying drawing, althoughvariations and modifications may be effected without departing from thespirit and scope of the novel concepts of the disclosure.

DESCRIPTION OF THE DRAWING The one FIGURE of the drawing is a partialfragmentary longitudinal sectional view taken through a burning deviceconstructed in accordance with the principles of the present invention.

DESCRIPTION OF THE PREFERRED FORM OF INVENTION The burning device, asshown in the drawing, includes a mixing tube 1 for mixing air with thecoke oven gas. A feeding nozzle 2 is provided at the intake end of saidmixing tube and has a reduced portion fitting into the inlet end of themixing tube and threaded therein as by threads generally indicated byreference numeral 12. The feeding nozzle 2 has a shouldered portionabutting the end of the mixing tube and extends from said mixing tube inan upstream direction and has a reduced diameter connector portion atits upstream end having a fitting 16 threaded thereon. The fitting 16 isadapted to be connected with a source of coke oven exhaust gas throughsuitable conduit means.

The feeding nozzle 2 has an inlet passageway 17 leading thereinto,terminating into a frusto-conical converging passageway 18 converging toa throat 19 opening into a chamber 20 of the mixing tube. Air inletopenings 3 lead into. said chamber 20 from opposite ends thereof. Theconverging passageway 18 and throat 19 thus form a Venturi effect,drawing air into the mixing tube through the air inlet passageways 3 toprovide a combustible mixture in said tube. The mixing tube 1 is shownas being threaded on a fitting 21 welded or otherwise secured to aflange or plate 15 and having communication with a passageway 22 leadingthrough said plate. The mixing tube may be threaded on the fitting 21 asby threads 13.

An enlarged diameter fitting or boss 23 is welded or otherwise securedto the opposite side of the plate 15 from the fitting 21 and has apassagewayleading therethrough having communication with the passageway22, in axial alignment therewith. The fitting 23 is internally threaded,as indicated by reference numeral 14 and has an interior portion 24 of aburner head 4 threaded therein. A main passageway 7-leads along saidinterior portion of said burner head.

The interior portion 24 of the burner head 4 has an intermediate radialflange 25 engaging an inwardly extending annular shouldered portion 26of a generally cylindrical casing 27 for the burner head. The casing 27extends along and beyond the output end of the interior portion 24 ofthe burner head and also serves to retain the burner tube 6 to thefitting 23, concentric with the interior portion 24 and casing 27 of theburner head.

As shown in the drawing, the burner tube 6 is of a substantially largerdiameter than the diameter of the burner head casing 27 and has aninwardly extending flange 29 abutting the boss or fitting 23 andretained thereto'by the shouldered portion 26 of the casing 27, as theburner tube is threaded in the fitting 23 and tightened thereto. Theburner tube 24 has a slotted outer end portion 30 to accommodate thetightening of said burner tube to the fitting 23 as by a tool of ascrewdriver-like form. Air inlet openings lead through the wall of theburner tube 6 upstream of the end of the casing 27, to accommodate thedrawing of air into said burner tube by the flow of gas through theburner, to contribute to the eddy currents or circumferential flow ofthe gas as it leaves the burner head. Spaced in advance or downstream ofthe burner head 4 is an annular baffle 11, shown as being formedintegrally with the burner tube 6 and extending inwardly therefrom andserving to baffle or block the flame leaving the burner head to confinethe flame to the confines of the burner tube as it leaves said burnertube.

An electrical igniter 5, which may be in the nature of a triggeringdevice or any other conventional form of igniter commonly used to ignitegas issuing from a burner head is provided to ignite the gas issuingfrom the burner head. Said igniter is herein shown as being in the formof a tube, carrier in an insulating support 33 mounted on the plate asby a mounting plate 35, through which said insulating support extends.The igniter tube is bent to extend at right angles to the axis of theinsulating support 33 and extends diametrically through an opening 36 inthe burner tube 6 downstream of the burner head, to ignite the gaseousmixture issuing from said burner head. The igniter 5 is no part of thepresent invention so need not herein be shown or described further. Aconductor 37 leads into the insulating support 33 and may be securedthereto as by a nut 39. The conductor 37 may be connected with asuitable source of supply of electrical energy under the control of asuitable control system (not shown), which may be of several well-knownforms and forms no part of the present invention, so need not herein beshown or described further.

It should here be noted that the space between the interior of thecasing 27 and the interior portion 24 of the burner head provides anannular gas passageway and has communication with the mixed gas enteringthe burner head through a series of angular passageways 8 extendingthrough said interior portion 24 of the burner head in angularlyforwardly and outward directions. Part of the gas passing into and alongthe burner head thus passes through the passageways 8 into the annularauxiliary chamber 9 at such an angle as to create circular eddy currentsin the auxiliary chamber 9, causing the gas issuing therefrom to confinethe gas issuing from the main channel 7, to thereby stabilize the flameat the end of the burner head as issuing therefrom. This provides astabilized combustion mixture prior to ignition of the gases withcircular eddy currents ignited by the igniter 5 and enhances the qualityand size of the flame in cooperation with the annular stabilizing baffle11, spaced along the burner tube 6, downstream of the trigger igniterdevice 5, which extends radially inwardly of the burner tube 6.

I claim as my invention: 1. A gas burner particularly adapted to burncoke oven exhaust gas comprising,

a mixing tube for the mixing of the gas with air to provide acombustible mixture, a gas feeding nozzle at the intake end of saidmixing tube have a converging discharge end extending into said mixingtube and creating a Venturi effect,

air inlet passageways leading into said mixing tube adjacent theconverging discharge end of said feeding nozzle to accommodate thedrawing of air into said mixing tube by the gas passing through saidfeeding nozzle to produce a combustible mixture in said mixing tube,

a burner head concentric with said mixing tube in communicationtherewith,

an electrical igniter spaced in advance of said burner head,

a burner tube extending about said burner head and in advance thereof,

said burner head having a cylindrical main passageway and an auxiliaryannular passageway extending about said main passageway concentrictherewith and having communication with said main passageway adjacentthe downstream end of said burner head.

2. The gas burner of claim 1, characterized in that the burner tube hasopenings leading thereinto from the atmosphere upstream of the gasissuing from said burner head.

3. The burner device of claim 2, characterized in that the burner tubehas an annular stabilizing baffle spaced downstream of the burner head.

4. The gas burner of claim 1, characterized in that the mixing tube, theburner head and feeding nozzle are connected in coaxial aligned relationwith respect to each other by threaded connections.

5. The gas burner of claim 3, wherein the electrical igniter is in theform of an electrical trigger tube entering said burner tubeperpendicular to the axis thereof and disposed between the end of saidburner head and said stabilizing baffle.

1. A gas burner particularly adapted to burn coke oven exhaust gascomprising, a mixing tube for the mixing of the gas with air to providea combustible mixture, a gas feeding nozzle at the intake end of saidmixing tube have a converging discharge end extendinG into said mixingtube and creating a Venturi effect, air inlet passageways leading intosaid mixing tube adjacent the converging discharge end of said feedingnozzle to accommodate the drawing of air into said mixing tube by thegas passing through said feeding nozzle to produce a combustible mixturein said mixing tube, a burner head concentric with said mixing tube incommunication therewith, an electrical igniter spaced in advance of saidburner head, a burner tube extending about said burner head and inadvance thereof, said burner head having a cylindrical main passagewayand an auxiliary annular passageway extending about said main passagewayconcentric therewith and having communication with said main passagewayadjacent the downstream end of said burner head.
 2. The gas burner ofclaim 1, characterized in that the burner tube has openings leadingthereinto from the atmosphere upstream of the gas issuing from saidburner head.
 3. The burner device of claim 2, characterized in that theburner tube has an annular stabilizing baffle spaced downstream of theburner head.
 4. The gas burner of claim 1, characterized in that themixing tube, the burner head and feeding nozzle are connected in coaxialaligned relation with respect to each other by threaded connections. 5.The gas burner of claim 3, wherein the electrical igniter is in the formof an electrical trigger tube entering said burner tube perpendicular tothe axis thereof and disposed between the end of said burner head andsaid stabilizing baffle.